Thank you for your reply, trying to get my head around it, it needs a little maturation and contemplation I am stuck with my 18-200mm, 3.5-5.6f at the moment, however I will bring my 50mm next time, I bought it for indoor photos of family parties. Never thought it might be my most valuable lens for finding classified satellites! In Norway however, this one is never visible... so I guess I will have some other satellites to look for there. Thanks again! On Sun, Dec 16, 2012 at 12:30 PM, C. Bassa <cgbsat@gmail.com> wrote: > Hi Petter, > > On 16/12/12 06:39, Petter Aslaksen wrote: > > I see the elsets are old. Any suggestions on what to do? Picking up a > > retrograde satellite with my shotgun photograpy approach should be > > feasible, right? > > It is certainly feasible! It depends on how wide your field of view is > and how sensitive your camera and lens are. In an earlier post you > mentioned owning a 50mm F/1.4; this would be a good lens to use as it is > both very sensitive and has a large field of view. > > As for finding Ofeq-5, this satellite has not been seen for 630 days so > the orbital elements will no longer be accurate (both because of drag, > but also because of possible maneuvers). To find Ofeq-5 you will have to > perform a planar search. See > http://www.satobs.org/seesat/Jun-2005/0205.html for an explanation. > > To illustrate that post, here are 5 plots showing the movement of the > Ofeq 5 plane from your location at 31.7361N, 6.0422E for yesterday evening. > http://dl.dropbox.com/u/52579487/1700.png > http://dl.dropbox.com/u/52579487/1730.png > http://dl.dropbox.com/u/52579487/1800.png > http://dl.dropbox.com/u/52579487/1830.png > http://dl.dropbox.com/u/52579487/1900.png > > Each of the numbered yellow/gray lines is prediction for an object in > the Ofeq 5 plane but with a different mean anomaly (the number indicates > the mean anomaly). The length of the line indicates the movement of that > object over the next 60s. When the line is yellow the object is > illuminated by the Sun; gray lines indicate they are in the shadow of > the Earth and hence not visible. > > To preform a planar search you will have to track the illuminated part > of the plane. Depending on the field of view you may have to reposition > your camera as often as every 10 or 15 minutes. > > I hope these suggestions make sense. > > Regards, > Cees > _______________________________________________ > Seesat-l mailing list > http://mailman.satobs.org/mailman/listinfo/seesat-l > -- ** *Petter* *31.7361°N, 6.0422°E / 63.4303°N, 10.4525°E* -------------- next part -------------- An HTML attachment was scrubbed... URL: http://mailman.satobs.org/mailman/private/seesat-l/attachments/20121216/57df4925/attachment.html _______________________________________________ Seesat-l mailing list http://mailman.satobs.org/mailman/listinfo/seesat-l
This archive was generated by hypermail 2b29 : Sun Dec 16 2012 - 12:25:48 UTC
